Accident Overview
A pilot conducted an instrument flight rules (IFR) departure into instrument meteorological conditions (IMC). Radar data showed that after takeoff, the airplane entered a left turn consistent with the assigned clearance. During the climb to approximately 2,410 feet above ground level, the rate of climb increased sharply from about 3,500 feet per minute to 9,600 feet per minute. The stick shaker activated, and the airspeed decreased to approximately 75 knots.
Sequence of Events
The airplane subsequently entered a descending right turn and rolled to an inverted attitude before impacting terrain roughly one mile from the departure airport. All major components were located at the accident site, and an examination of the wreckage revealed no pre-existing mechanical anomalies that would have prevented normal operation.
Weather Conditions
Weather conditions at the time included an overcast cloud ceiling about 600 feet above ground level.
Analysis
It is likely that after entering the cloud layer, the pilot experienced spatial disorientation. This disorientation led to the airplane's abnormally high rate of climb, rapid loss of airspeed, and a likely aerodynamic stall. The subsequent steep descending right turn, inversion, and high-energy impact are consistent with a loss of control resulting from spatial disorientation.
Probable Cause
The probable cause of the accident is spatial disorientation following entry into instrument meteorological conditions, which resulted in a loss of control.